<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
    <link rel="stylesheet" href="./css/counter.css">
</head>

<body>
    <div id="app" style="background-color:#dadada;width: 300px;" >
        <div class="result">
            <input type="text" v-model="counter"
                style="width: 200px;height: 60px;font-size:30px;background-color: whitesmoke">
        </div>
        <div class="items">
            <div class="item" @click="counter+=0">0</div>
            <div class="item" @click="counter+=1">1</div>
            <div class="item" @click="counter+=2">2</div>
            <div class="item" @click="counter+=3">3</div>
            <div class="item" @click="counter+=4">4</div>
            <div class="item" @click="counter+=5">5</div>
            <div class="item" @click="counter+=6">6</div>
            <div class="item" @click="counter+=7">7</div>
            <div class="item" @click="counter+=8">8</div>
            <div class="item" @click="counter+=9">9</div>
        </div>
    </div>
</body>

<script>
    const counter = {
        data() {
            return {
                counter: 0
            }
        }
    }
    Vue.createApp(counter).mount("#app")
</script>

</html>